Pump



Jan. 19, 1965 w. ROLLINGER PUMP Filed Dec. 18, 1961 \0 Hi5 R5 U. in ar United States Patent ()ffice 3,166,240 Patented Jan. 19, 1965 3,166,240 PUMP Wiliy Riillinger, Cologne-Konigsforst, Germany, assignor, by inesue assignments, to Leybold Holding A.G., Zug, Switzerland Filed Dec. 18, 1961, Scr. No. 169,111 Claims priority, application Germany, Dec. 24, 1960, L 37,815 11 Claims. (Cl. 230-207) The present invention relates generally to oil sealed rotary pumps, such as rotary slide vane pumps or rotary piston pumps, and more particularly to a pump for generating a vacuum wherein the outlet valve, which is preferably arranged laterally of the pump, has a superposed oil supply.

In these types of vacuum pumps it is conventional to arrange the oil supply in a chamber in an upper housing section above the pump proper, with the exhaust conduit, and usually the intake conduit also, passing therethrough. This arrangement has proved to be very impractical because even for small or minor repair jobs, for example, repairing the valves, this upper housing section must be dismounted. However, in order to remove the housing section the connection conduits must first be removed or detached from the pump. Furthermore, these known pumps lead to highly unfavorable arrangements if the drive motor cannot be placed next to the pump but must be placed on top of or below the pump. The reason is that when space is at a premium, this disposition of the motor adds to the bulkiness of the pump. Further, if pumps of this type are to be connected to horizontally disposed conduits, pipe elbows or other structural elements deflecting the direction of flow must be interposed, and such members are disadvantageous in that they impair the eliective evacuation performance of the pump due to their throttling eiiect.

With these defects of the prior art in mind, it is a main object of this invention to design a pump having a laterally detachable housing section for ease in repair when fixing the pump.

Another object of this invention is to provide a pump arrangement wherein the motor may be mounted on top of the pump without the over-all height thereof exceeding that of the prior art pumps without considering their motors.

These objects and others ancilliary thereto are accomplished according to preferred embodiments of the invention, wherein the oil supply chamber or housing is connected with an oil separating section, and both are arranged laterally of the pump and in a laterally detachable housing section. The intake conduit and the outlet conduit are arranged in the pump housing in such a manner that the lateral housing section forming the oil supply chamber and the oil separating chamber may be easily detached laterally. The gas which is exhausted through the exhaust valve passes through the supply of oil and is conducted back into the pump body housing to the outlet which is in the pump housing. Since the intake and outlet conduits are now connected directly to the pump body, the lateral housing section may be easily detached for cleaning, maintenance, and repair work, without the necessity for dismounting the conduits also. Therefore, the present invention allows for lateral connection of the conduits and the separator and permits mounting of the motor on the top of the pump without the over-all height thereof exceeding that of the prior art pumps without motors.

An oil collecting device, which is known per se, is arranged in the lateral detachable housing section. If it is desired to provide the oil outlet elsewhere than at the lowest point of the lateral housing section, where difficulties will be encountered with regard to servicing which then becomes cumbersome, a more favorable and convenient arrangement is provided when throttle means are provided in the outlet line for emptying the lateral oil supply chamber. An oil outlet valve is provided above the oil level and is coupled with the throttle means provided in the outlet line. Furthermore, the coupling member may be preferably designed as a tension spring which is arranged so that the excess pressure formed in the oil supply chamber above the oil level is sufiicient to force the oil to be discharged through the oil outlet line to the outlet valve.

Additional objects and advantages of the present invention will become apparent upon consideration of the following description when taken in conjunction with the accompanying drawings in which:

FIGURE 1 is a side elevational view of the pump assembly with the oil supply chamber and the oil separating chamber partially broken away for purposes of clarity.

FIGURE 2 is a vertical sectional view taken substan tially along the plane defined by line 2-2 of FIGURE 1.

FIGURE 3 is a horizontal sectional View taken substantially along the plane defined by line 33 of FIG- URE 2.

With more particular reference to the drawings, the pump housing 1 has a pumping chamber 2 and a pumppiston 3 which is movably mounted by means of a cam 4. The flat slide vane 5, which is connected with the pump piston 3, is mounted in a block 6 in such manner that pump piston 3 may have an oscillating reciprocating movement. This conveys the gas flowing into the pumping chamber 2 through slots by means of the slide vane 5 from the suction port 7 and the suction valve chamber 71 to the exhaust chamber 8. Before entering the exhaust chamber 8 this gas must flow through exhaust valves 9 and through the oil in an oil supply section or chamber 10 which is arranged laterally with respect to the pump. The oil supply chamber 10, a portion 81 of the exhaust chamber 8, and an oil separating section or chamber 11 in which an oil collecting device is arranged, together form a laterally detachable housing section 13 which may be freely removed from the pump proper. The gas delivered by the pump is freed from the oil, which is carried along as it passes through the oil supply chamber, in the oil collecting device 12. This gas passes through an opening 14 in the pump housing 1 from which it is then discharged through outlet port 15 into the atmosphere.

The oil in the oil supply chamber may be discharged if necessary by means of an oil outlet valve 16, which is arranged on the housing section 13. A throttle valve 18 is provided which is actuated in response to actuation of the valve 16. Actuation of the valve 18 is brought into effect by means of an elastic coupling member 17 which may be a spring or the like coupled to the oil valve 16. Tins throttling member will close the front of opening 14- so that excess pressure will be provided in the exhaust chamber 8 which forces the oil from oil reservoir chamber 10 through the oil removal line 19 and the valve 16 so that the oil in supply chamber 10 may be discharged.

It will be understood that the above description of the present invention is susceptible to various modifications, changes, and adaptations, and the same are intended to be comprehended within the meaning and range of equivalents of the appended claims.

What is claimed is:

1. An oil sealed rotary pump assembly, comprising, in combination:

(a) a pump housing including a rotary pumping mechanism having an inlet port and a laterally arranged 7 outlet valve,

(b) an oil reservoir housing laterally detachable from said pump housing and containing an oil separating of) section, and an oil supply section for superposing a volume of oil on said outlet valve,

() an outlet chamber in said pump housing in communication with said outlet valve via said oil supply section in said detachable oil reservoir housing, and

(d) an inlet chamber in said pump housing in communication with said inlet port.

2. An assembly as defined in claim 1, comprising throttle means insaid outlet chamber for throttling flow therethrough and thus increasing the pressure in said oil supply member for use in emptying oil from said oil supply member.

3. An assembly as defined in claim 2, comprising an oil outlet valve in communication with said oil supply section and arranged above the oil level and coupled with said throttle means.

4. An assembly as defined in claim 3, wherein coupling is accomplished by a coupling member.

5. An assembly as defined in claim 4, wherein said coupling member is a tension spring, said spring being arranged so that excess pressure formed in the oil supply section above the oil level when said throttling means are actuated is sufficient to force the oil to be discharged to the oil outlet valve.

6. An oil sealed rotary pump assembly, comprising, in combination:

(a) a rotary pumping mechanism, an inlet port, an outlet port, an outlet exhaust valve, an oil separating section, and chamber means connecting said inlet and outlet ports via said rotary pumping mechanism and said outlet exhaust valve; and

(b) an oil reservoir adapted to superpose a volume of oil on the outlet side of said outlet exhaust valve, an oil outlet valve, an oil removal line connected to said oil outlet valve and extending into the lower portion of said oil reservoir, and a throttling device adapted to throttle the gas flow through said outlet port so as to increase the pressure in said oil reservoir and force oil out of said oil outlet valve via said oil removal line.

7. An oil-sealed rotary pump assembly, comprising, in

combination:

(a) a pump housing including a rotary pumping mechanism, an inlet port, an outlet port, an outlet exhaust valve, an oil separating section, and chamber means connecting said inlet and outlet ports via said rotary pumping mechanism and said outlet exhaust valve;

(b) an oil reservoir housing connected to and laterally detachable from said pump housing which includes said inlet and outlet ports and adapted to superpose a volume of oil on the outlet side of said outlet exhaust valve and to expose upon detachment said oil separating section and said outlet exhaust valve, said oil reservoir having a closable oil outlet open ing positioned in the upper portion thereof; and

(c) an oil removal line connected to said oil outlet opening and extending into the lower portion of said oil reservoir.

8. An oil sealed rotary pump assembly, comprising, in

combination:

(a) a pump housing including a rotary pumping mechanism, an inlet port, an outlet port, an outlet exhaust valve, an oil separating section, and chamber means connecting said inlet and outlet ports via said rotary pumping mechanism and said outlet exhaust valve;

(b) an oil reservoir housing detachably connected to said pump housing which includes said inlet and outlet ports and adapted to superpose a volume of oil on the outlet side of said outlet exhaust valve and to expose upon detachment said oil separating section and said outlet exhaust valve, said oil reservoir having a closable oil outlet opening in the upper portion thereof; and

(c) an oil removal line connected to said oil outlet opening and extending into the lower portion of said oil reservoir, and a throttling device adapted to throttle the gas flow through said outlet port so as to increase the pressure in said oil reservoir and force oil up through said oil removal line and out of said oil outlet opening.

9. An oil sealed rotary pump assembly according to claim 8 wherein said oil reservoir is laterally detachable from said pump housing.

10. An oil sealed rotary pump assembly, comprising, in combination: 7

(a) a pump housing including a rotary pumping mechanism, an inlet port, an outlet port, an outlet exhaust valve, adapted to exhaust in a lateral direction from said pump housing, an oil separating section, and chamber means connecting said inlet and outlet ports via said rotary pumpingmechanism and said outlet exhaust valve; and

(b) an oil reservoir housing detachably connected to :said pump housing which includes said inlet and outlet ports and adapted to superpose a volume of oil on the outlet side of said outlet exhaust valve and to expose upon detachment of said oil separating section and said outlet exhaust valve.

11. An oil sealed rotary pump assembly, comprising,

in combination:

(a) a pump housing including a rotary pumping mechanism, an inlet port, an outlet port, said inlet and outlet ports positioned in horizontal alignment on opposite sides of said pump housing, an outlet exhaust valve, an oil separating sec-tion, and chamber means connecting said inlet and outlet ports via said rotary pumping mechanism and said outlet exhaust valve;

(b) an oil reservoir housing detachably connected to said pump housing which includes said inlet and outlet ports and adapted to superpose a volume of oil on the outlet side of said outlet exhaust valve and to expose upon detachment of said oil separating section and said outlet exhaust valve; and

(c) an oil separating section positioned between the outlet side of said outlet exhaust valve and said outlet port. 1

References Cited by the Examiner UN iTED STATES PATENTS 517,337 3/94 Fleuss 230203 775,065 11/04 Lawless 2 2240l 1,648,885. 11/27 Seitz 230-205 1,653,814 12/27 Mild 230-205 1,913,657 6/33 Buchanan et al. 230-149 2,070,151 2/37 Westin 230147 LAURENCE V. EFNER, Primary Examiner. ROBERT M. WALKER, Examiner. 

1. AN OIL SEALED ROTARY PUMP ASSEMBLY, COMPRISING, IN COMBINATION: (A) A PUMP HOUSING INCLUDING A ROTARY PUMPING MECHANISM HAVING AN INLET PORT AND A LATERALLY ARRANGED OUTLET VALVE, (B) AN OIL RESERVOIR HOUSING LATERALLY DETACHABLE FROM SAID PUMP HOUSING AND CONTAINING AN OIL SEPARATING SECTION, AND AN OIL SUPPLY SECTION FOR SUPERPOSING A VOLUME OF OIL ON SAID OUTLET VALVE, (C) AN OUTLET CHAMBER IN SAID PUMP HOUSING IN COMMUNICATION WITH SAID OUTLET VALVE VIA SAID OIL SUPPLY SECTION IN SAID DETACHABLE OIL RESERVOIR HOUSING, AND (D) AN INLET CHAMBER IN SAID PUMP HOUSING IN COMMUNICATION WITH SAID INLET PORT. 